hskwon
aca1767eb9
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58 lines
1.7 KiB
TypeScript
58 lines
1.7 KiB
TypeScript
import { Blob } from '@google/genai';
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// Convert base64 string to raw bytes
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export function decode(base64: string): Uint8Array {
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const binaryString = atob(base64);
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const len = binaryString.length;
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const bytes = new Uint8Array(len);
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for (let i = 0; i < len; i++) {
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bytes[i] = binaryString.charCodeAt(i);
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}
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return bytes;
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}
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// Convert raw bytes to base64 string
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export function encode(bytes: Uint8Array): string {
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let binary = '';
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const len = bytes.byteLength;
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for (let i = 0; i < len; i++) {
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binary += String.fromCharCode(bytes[i]);
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}
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return btoa(binary);
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}
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// Decode raw PCM bytes into an AudioBuffer
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export async function decodeAudioData(
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data: Uint8Array,
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ctx: AudioContext,
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sampleRate: number = 24000,
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numChannels: number = 1
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): Promise<AudioBuffer> {
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const dataInt16 = new Int16Array(data.buffer);
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const frameCount = dataInt16.length / numChannels;
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const buffer = ctx.createBuffer(numChannels, frameCount, sampleRate);
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for (let channel = 0; channel < numChannels; channel++) {
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const channelData = buffer.getChannelData(channel);
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for (let i = 0; i < frameCount; i++) {
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channelData[i] = dataInt16[i * numChannels + channel] / 32768.0;
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}
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}
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return buffer;
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}
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// Create a Blob formatted for the Gemini Live API (PCM 16kHz)
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export function createPcmBlob(data: Float32Array): Blob {
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const l = data.length;
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const int16 = new Int16Array(l);
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for (let i = 0; i < l; i++) {
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// Clamp values to [-1, 1] to prevent distortion
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const s = Math.max(-1, Math.min(1, data[i]));
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int16[i] = s < 0 ? s * 0x8000 : s * 0x7FFF;
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}
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return {
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data: encode(new Uint8Array(int16.buffer)),
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mimeType: 'audio/pcm;rate=16000',
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};
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}
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